21023230 has 8 divisors (see below), whose sum is σ = 37841832. Its totient is φ = 8409288.

The previous prime is 21023213. The next prime is 21023257. The reversal of 21023230 is 3232012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21023230.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051152 + ... + 1051171.

It is an arithmetic number, because the mean of its divisors is an integer number (4730229).

Almost surely, 2^21023230 is an apocalyptic number.

21023230 is a deficient number, since it is larger than the sum of its proper divisors (16818602).

21023230 is a wasteful number, since it uses less digits than its factorization.

21023230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102330.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21023230 is about 4585.1095952005. The cubic root of 21023230 is about 275.9941100052.

Adding to 21023230 its reverse (3232012), we get a palindrome (24255242).

The spelling of 21023230 in words is "twenty-one million, twenty-three thousand, two hundred thirty".